Process of staining marble.



' OUGH, a citizen 1 UNITED STATES PATENT OFFICE.

Ia. 0E OHIO.

No Drawing.

To all whom it may concern:

Be it known that I Ma'rrnnw L. McDono the United States, residing at Cincinnati, in the county of Hamilton, and State of Ohio, have invented certain new and usefullmprovements in Processes of sta nilriig Marble, of which the following is a spec cation.

The object of my invention is a process of staining marble, whereby a rich colpr 1s ixlnlpawd to the ma; le, which givestemar epe rope talnnga high polish and which is car d out at little expense.

In the first step of my process the marble is heated by any suitable means, as b fire or any means, or electricity; steam heat being preferred, since therewith the pores of the marble aremore 0 en.

While the marble is thus heated, I perform the second step of the process, viz: apply the stain whic of coal oil, alcohol and color desired. a The alcohol and coal oil carry the dye well into the pores of the marble, and are themselves evaporated by the heat of the an anilin dye of the rmanent .h t and second app y g consists of a mixture r m t mmmm Patented Feb. 11, 1919. a lication fled June 1a, 1912. Serial in. 104,525.

marble, leaving the dye set in the marble permanently.

The marble may then be polished, and

will, after this process, take a higher polish,

than it would "before being subjected thereto. If desired, the marble may be polished beforeit undergoes the process, and, will in this event, retain the polish so given it, after it has undergone my process of staining.

What I claim as new and my invention and desire to secure by Letters Patent is:

1. The process of staining marble, which consists in first subjecting the marble to to the heated marble a mixture of coal alcohol and an anilin dye, as set forth.

2. The process of staining marble, which consists in first subjecting the marble to steam heat, and second, apglying to the marble so heated a mixture 0 coal oil, alcohol and an anilin dye, as set forth.

In testimon whereof I aflix my signature in presence 0 two witnesses.

MATTHEW L. MGDONOUGH. Witnesses:

W. A. RINOKHOFF, J. W. S'mnHm. 

